1 /* parport.h: sparc64 specific parport initialization and dma. 2 * 3 * Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be) 4 */ 5 6 #ifndef _ASM_SPARC64_PARPORT_H 7 #define _ASM_SPARC64_PARPORT_H 1 8 9 #include <linux/of_device.h> 10 11 #include <asm/ebus_dma.h> 12 #include <asm/ns87303.h> 13 #include <asm/prom.h> 14 15 #define PARPORT_PC_MAX_PORTS PARPORT_MAX 16 17 /* 18 * While sparc64 doesn't have an ISA DMA API, we provide something that looks 19 * close enough to make parport_pc happy 20 */ 21 #define HAS_DMA 22 23 static DEFINE_SPINLOCK(dma_spin_lock); 24 25 #define claim_dma_lock() \ 26 ({ unsigned long flags; \ 27 spin_lock_irqsave(&dma_spin_lock, flags); \ 28 flags; \ 29 }) 30 31 #define release_dma_lock(__flags) \ 32 spin_unlock_irqrestore(&dma_spin_lock, __flags); 33 34 static struct sparc_ebus_info { 35 struct ebus_dma_info info; 36 unsigned int addr; 37 unsigned int count; 38 int lock; 39 40 struct parport *port; 41 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; 42 43 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); 44 45 static inline int request_dma(unsigned int dmanr, const char *device_id) 46 { 47 if (dmanr >= PARPORT_PC_MAX_PORTS) 48 return -EINVAL; 49 if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) 50 return -EBUSY; 51 return 0; 52 } 53 54 static inline void free_dma(unsigned int dmanr) 55 { 56 if (dmanr >= PARPORT_PC_MAX_PORTS) { 57 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); 58 return; 59 } 60 if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { 61 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); 62 return; 63 } 64 } 65 66 static inline void enable_dma(unsigned int dmanr) 67 { 68 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); 69 70 if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, 71 sparc_ebus_dmas[dmanr].addr, 72 sparc_ebus_dmas[dmanr].count)) 73 BUG(); 74 } 75 76 static inline void disable_dma(unsigned int dmanr) 77 { 78 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); 79 } 80 81 static inline void clear_dma_ff(unsigned int dmanr) 82 { 83 /* nothing */ 84 } 85 86 static inline void set_dma_mode(unsigned int dmanr, char mode) 87 { 88 ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); 89 } 90 91 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) 92 { 93 sparc_ebus_dmas[dmanr].addr = addr; 94 } 95 96 static inline void set_dma_count(unsigned int dmanr, unsigned int count) 97 { 98 sparc_ebus_dmas[dmanr].count = count; 99 } 100 101 static inline unsigned int get_dma_residue(unsigned int dmanr) 102 { 103 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); 104 } 105 106 static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match) 107 { 108 unsigned long base = op->resource[0].start; 109 unsigned long config = op->resource[1].start; 110 unsigned long d_base = op->resource[2].start; 111 unsigned long d_len; 112 struct device_node *parent; 113 struct parport *p; 114 int slot, err; 115 116 parent = op->node->parent; 117 if (!strcmp(parent->name, "dma")) { 118 p = parport_pc_probe_port(base, base + 0x400, 119 op->irqs[0], PARPORT_DMA_NOFIFO, 120 op->dev.parent->parent, 0); 121 if (!p) 122 return -ENOMEM; 123 dev_set_drvdata(&op->dev, p); 124 return 0; 125 } 126 127 for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { 128 if (!test_and_set_bit(slot, dma_slot_map)) 129 break; 130 } 131 err = -ENODEV; 132 if (slot >= PARPORT_PC_MAX_PORTS) 133 goto out_err; 134 135 spin_lock_init(&sparc_ebus_dmas[slot].info.lock); 136 137 d_len = (op->resource[2].end - d_base) + 1UL; 138 sparc_ebus_dmas[slot].info.regs = 139 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); 140 141 if (!sparc_ebus_dmas[slot].info.regs) 142 goto out_clear_map; 143 144 sparc_ebus_dmas[slot].info.flags = 0; 145 sparc_ebus_dmas[slot].info.callback = NULL; 146 sparc_ebus_dmas[slot].info.client_cookie = NULL; 147 sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; 148 strcpy(sparc_ebus_dmas[slot].info.name, "parport"); 149 if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) 150 goto out_unmap_regs; 151 152 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); 153 154 /* Configure IRQ to Push Pull, Level Low */ 155 /* Enable ECP, set bit 2 of the CTR first */ 156 outb(0x04, base + 0x02); 157 ns87303_modify(config, PCR, 158 PCR_EPP_ENABLE | 159 PCR_IRQ_ODRAIN, 160 PCR_ECP_ENABLE | 161 PCR_ECP_CLK_ENA | 162 PCR_IRQ_POLAR); 163 164 /* CTR bit 5 controls direction of port */ 165 ns87303_modify(config, PTR, 166 0, PTR_LPT_REG_DIR); 167 168 p = parport_pc_probe_port(base, base + 0x400, 169 op->irqs[0], 170 slot, 171 op->dev.parent, 172 0); 173 err = -ENOMEM; 174 if (!p) 175 goto out_disable_irq; 176 177 dev_set_drvdata(&op->dev, p); 178 179 return 0; 180 181 out_disable_irq: 182 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 183 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 184 185 out_unmap_regs: 186 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); 187 188 out_clear_map: 189 clear_bit(slot, dma_slot_map); 190 191 out_err: 192 return err; 193 } 194 195 static int __devexit ecpp_remove(struct of_device *op) 196 { 197 struct parport *p = dev_get_drvdata(&op->dev); 198 int slot = p->dma; 199 200 parport_pc_unregister_port(p); 201 202 if (slot != PARPORT_DMA_NOFIFO) { 203 unsigned long d_base = op->resource[2].start; 204 unsigned long d_len; 205 206 d_len = (op->resource[2].end - d_base) + 1UL; 207 208 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 209 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 210 of_iounmap(&op->resource[2], 211 sparc_ebus_dmas[slot].info.regs, 212 d_len); 213 clear_bit(slot, dma_slot_map); 214 } 215 216 return 0; 217 } 218 219 static const struct of_device_id ecpp_match[] = { 220 { 221 .name = "ecpp", 222 }, 223 { 224 .name = "parallel", 225 .compatible = "ecpp", 226 }, 227 { 228 .name = "parallel", 229 .compatible = "ns87317-ecpp", 230 }, 231 {}, 232 }; 233 234 static struct of_platform_driver ecpp_driver = { 235 .name = "ecpp", 236 .match_table = ecpp_match, 237 .probe = ecpp_probe, 238 .remove = __devexit_p(ecpp_remove), 239 }; 240 241 static int parport_pc_find_nonpci_ports(int autoirq, int autodma) 242 { 243 of_register_driver(&ecpp_driver, &of_bus_type); 244 245 return 0; 246 } 247 248 #endif /* !(_ASM_SPARC64_PARPORT_H */ 249